246 GYMNANCYLA CANELLA. 



it lies stretched out ; when once in its web it is not 

 easily dislodged, and if driven out still hangs on by a 

 short thread, and soon returns again if not further 

 disturbed. When full-grown it enters the sand and 

 there constructs a cocoon of the surrounding particles, 

 sometimes attaching it to a stone. 



The youngest example of the larva that I found 

 was less than a quarter of an inch long, of a pale 

 semi-transparent glaucous-green colour, with a black 

 head and plate behind it. With growth the colour 

 changes to an opaque ochreous-green, or to an olive- 

 green, sometimes to a reddish-grey, the black head 

 and plate continuing as long as the larva mines within 

 the plant. 



The full-grown larva is five-eighths of an inch in 

 length, slender, tapering from the back of the second 

 segment to the head, which is partly retracted within 

 it ; the second segment is quite as long as any of the 

 others ; the body tapers also a little gradually from 

 the tenth to the anal tip ; on the thoracic segments 

 there are deeply defined wrinkles, but on the others 

 there is only one deep subdividing wrinkle, and 

 another very slight one near the segmental division ; 

 all the legs are small and well under the body, which 

 is cylindrical though just a trifle flattened on the back 

 and belly. 



In colour the head is pale brownish-ochreous, 

 marked on each lobe more or less with blackish-brown ; 

 the plate on the second segment is shining, and often 

 faintly edged at the side with a slight streak of blackish, 

 and is generally rather more inclining to ochreous, 

 but is otherwise similar to the rest of the body in 

 markings ; the ground colour is generally of a glaucous- 

 green tint, deeper on the back and sides, and paler on 

 the belly and legs; the dorsal line is a deep pink, or 

 dark green, very faintly edged with a fine line of 

 paler green than the ground colour; the subdorsal 

 line is distinctly paler whitish -green, the line just 

 above the spiracles is similar, and the space between 



